Which is totally fine, if he's on a reasonable contract and in a more limited role. When he turns it on, he is still an absolute monster. He just doesn't have the ability to turn it on for a huge amount of snaps in a row. Especially if he sees any kind of double team.
Pay him 100k base, with bonuses to go up 50k+ if he has a monster year. Make him a naturalized Canadian and rotate him as the 3rd end. He shouldn't play man run downs anyway. But in passing situations, let him go for 15-20 snaps a game at 100%. Hell, make use of him in in niche roles like when we tried to throw him the ball, or let him run off the edge and try to block kicks. Give him a guy to pair with who will take the brunt of the physical impact off on kick rushing etc.